Device for coupling two transmission-shafts.



A. C. KREBS. DEVICE FOR COUPLING TWO TRANSMISSION SHAITS. APPLICATION FILED D30. 7, 1909.

976,187. Patented N0v.22, 1910.

v ARTHUR GONSTANTIN KREIBS, OF PARIS, FRA1\I'CE, ASSIGNOR T SOCIETE ANONYME DES ANCIENS ETABLISSEMENTS PANHARE ET LEVASSOR, OF PARIS, FRANCE.

DEVICE FOR COUPLING TWO TRANSMISSION-SHAFTS.

Specification of Letters Patent.

Patented Nov. 22, 1910.

Application filed December 7,1909. Serial No. 531,903.

' Knees, a citizen of the Republic of France,

residing in Paris, France, have invented new and useful Improvements in Devices for Coupling Two Transmission-Shafts, which improvements are fully set forth in the following specification.

My mventlon relates to means for coupling together a driving and a driven shaft' arranged in alinement or substantial alinement, and consists more particularly stated in the provision of a non-metallic flexible connection secured to the ends of' thesaid shafts.

Two non-flexible shafts each supported by two bearings, produce great friction in their bearings and heat them at the ex ense of the power transmitted, if the said earings are not absolutely in line. Even if that condition is fulfilled when the shafts are at rest, deformation of the whole frame sup porting the said shafts, when the driving and resisting strains act on it, is often sufiicient to cause the shafts to move out of line and to cause heating and premature wear of the bearings. I Moreover, in transmit-ting high speed, it is always advisable to avoid transmitting certain metallic vibrations produced by shocks or by rapid alternating movements of certain mechanism, to other apparatus which are more delicate, for instance to generators or motors.

. The result in question is attained by the use of the device forming the subject of this invention, which does away with metallic connections between the two shafts and prevents vibrations from being transmitted from one to another.

The device in question is substantially as follows :-The ends of the shafts to be joined, facing each other, are provided with circular or cylindrical extended portions to which is secured alternately a membrane of suitable shape, of strong and flexible material such as leather, flexible fiber, suitably Woven and prepared canvas or any other similar material. The dimensions of the said widened portions and the number of the points at which the material used for effecting the connection indicated is secured to them are in proportion to the strain to be transmitted.

The invention is illustrated in the accompanying drawing.

In the drawing, the two shafts A and B .to be connected, terminate respectively in cylindrical flanges C and D facing each other, but arranged at a certain distance apart so as to avoid contact. Around their clrcumference is arranged a membrane E of the composition hereinbefore specified and secured to the said flanges by means of screws, rivets or bolts F, or even in certain cases simply by nails, so as to form a connection between the two shafts.

The diameter of the flanges, the number and the diameter of the parts for securing the membrane to the flanges, and the composition and strength of the said membrane are, as already stated, in proportion to the strain to be transmitted, so as to afford suitable security. The membrane owing to the pliability and facility of deformation which it has, transmits the torque to which the shafts are submitted from one to the other of the said two shafts without any components normal to the axis being produced, which result in friction in the bearings and injurious heating, as in the case when metallic and rigid couplin s are used with shafts which are not abso utely in line.

In the construction shown, the two disks C and D terminating the shafts A and B to be connected, are disks to which the mem-,

inserted,

vided, opposite the point of securing the membrane to the opposite disk, wit-h an aperture G for facilitating the said securing.

Having now particularly described and ascertained the nature of mysaid invention and in what manner-the same is to be performed, I declare that what I claim is:

Power-transmitting means, comprising the combination of a driving shaft and a driven shaft arranged in substantial alinement with each other, the ends of each shaft being provided with a plain, circular flange, and a non-metallic, flexible, circular diaphragm of pecification in the presence of two sub equal diameter with siaid flanges, placed beci scribing witnesses. tween t e atter an rivets securing sai diaphra m alternately to One and the other ARTHUR CONSTANTIN KREBS' 5 of said anges, so that it assumes an undu- Witnesses:

lated form. EMILE LEDRET,

' In testimony whereof I have signed this H. O. Come. 

